Roll spindle

ABSTRACT

A drive spindle for gripping the winding sleeve for paper rolls by means of inflatable hoses arranged in notches in the spindle surface. When inflated, these hoses displace pressing elements preferably in the shape of profiled rails outwards into gripping engagement with the winding sleeve which is thereby held firmly in contact with the spindle, and in the deflated state of the hoses, the sleeve can be easily removed from the spindle without any risk of damages to either the spindle or the sleeve. The engagement between the spindle and the sleeve is further enhanced by rails disposed on the spindle surface and cooperating with the pressing elements.

United States Patent [111 3,552,672

[72] Inventor Karl Einar Lage Grettve [56] References Cited Y Lilla Eder, Sweden UNITED STATES PATENTS Y? l- APPL M' 80226561969 3,048,345 s/1962 Willard 242/7213 gfedmed 5 i971 3,273,817 9/1966 Damimn 242/7213 [73] Assignee Aktiebologet Aero-Shaft Primary Examiner-Nathan L- Mimi Lilla Edet, Sweden Attorney-Plumley, Tyner & Sandt by mesne assignments Pnomy gfvl'dzez 1968 ABSTRACT: A drive spindle for gripping the winding sleeve [31] No 2527/68 for paper rolls by means of inflatable hoses arranged in notches in the spindle surface. When inflated, these hoses displace pressing elements preferably in the shape of profiled rails outwards into gripping engagement with the winding sleeve which is thereby held firmly in contact with the spindle, [54] LE. F and in the deflated state of the hoses, the sleeve can be easily C s rawmg igs removed from the spindle without any risk of damages' to [52] U.S. Cl 242/72 either the spindle or the sleeve. The engagement between the [5l Int. Cl. B65h 75/24 spindle and the sleeve is further enhanced by rails disposed on [50] Field of Search 242/72, the spindle surface and cooperating with the pressing ele- 72B ments.

PATENTED JAN 5 @n sum 1 or 3 INVENTOR.

mmm .m4 slam vSHEU 2 uf 3 IN VENTOR. 4a Mc- WML 5/4/,4

ROLL SPINDLE The present invention relates to drive spindles for grippin winding sleeves for paper rolls and the like, of the kindv being provided with expanding means in the form of hoses inserted in longitudinal notches in the spindle and adapted, when infiated, to displace radially outwards a pressing element in the shape of a rod inserted one in each notch, in such a manner that the radially outer border of the element, serving as a catching border, against the inner surface of the winding sleeve, will extend outside the periphery of the spindle. Hitherto the core of such pneumatic and expansible roll spindles has been made from a solid bar blank in which the notches for receiving the rod-shaped pressing element have been made through milling or cutting. The pressing elements consist of planed longitudinal rods which present stop ribs at their radially inner borders, said elements being prevented by corresponding ribs projecting sidewards into the notches of the spindle core at the periphery of the spindle, from leaving the spindle when being radially displaced. A roll spindle of this type is heavy and expensive to manufacture and in addition vdifficult to handle.

The object ofthe present invention is to overcome these drawbacks and provide an expansible roll spindle which cornbines minimum weight with greatestposs'ible carrying capacity and toughness against'stresses in general while'at the same time keeping the ymanufacturing andtechnical construction simple. The characteristic feature of the invention is to be seen therein that the notches made in the spindle core are disposed in a profiled tube and have outwardly diverging sidewalls and in that longitudinal sheet metal rails of substantially arclike cross section are attached 4to longitudinally extending beads formed in the tube between the grooves, the longer borders of said rails serving as guides for the pressing elements.

The spindle core may, irrespective of its diameter or its length, be manufactured from a rolled, forged or drawn profiled tube having a thickness of material suitable for the purpose in view. The notches could be of essentially the same shape irrespective of their number along the periphery of the profiled tube, i.e. irrespective of the outer diameter of the profiled tube. A

. To increase the moment of resistance of the roll spindlev the latter could be reinforced internally by means of a tube inserted axially in the profiled tube and attached to the bottom of the notches.

In accordance with a preferred-embodiment of the invention the pressing elements consist of profiled rails of T-shaped cross section the legs of the cross bar of the T forming an obtuse angle relatively each other, the hose engaging in the angle between said two legs. By this arrangement the pressing elements are supported in lateral direction on account of the pressures exerted against the legs by the hose.

The invention will be described more in dtail in the following, reference being had to the accompanying drawings, in which:

FIG. l is a partly broken longitudinal section through a roll spindle in accordance with the invention; T-shaped FIG. 2 is a section therethrough, shown on an enlarged scale;

FIG. 3 shows on an enlarged scale a section on line III-III of FIG. 1; v FIG. 4 shows a section through the profiled tube proper;

FIG. 5 is a modification showing a section through the roll spindle provided with an axially inner reinforcement tube;

FIG. 6 shows another modification in side elevation of one end of a roll spindle having essentially U-shaped pressing element rods; and FIG. 7 shows on an enlarged scale a section through said roll spindle.

The profile tube 1 shown in FIG. 4 and serving as a core for the roll spindle may be manufactured through rolling. It is provided with five longitudinally extending notches 2 having outwardly diverging walls 3 and a fiat bottom 4. The walls 3 ought to have the shape indicated in order to facilitate the rolling operation. To each one of the beads 5 formed between the notches 2 is attached a longitudinal rail 6 of sheet metal the sectional shape of which is that of an arc of a circle. The width of the rails 6 is chosen such that gaps 7 are formed between longitudinal rail borders through which gaps the pressing elements 8 having T-shaped cross section could, by means of their T-stem 9 be displaced radially outwards. The cross stems or legs l0 of the pressing elements 8 enclose an obtuse angle Il with each other. In the ends of the profiled tube l are inserted trunnions l2, 13 which by means of a welding seam 14 are secured to the profiled tube.

A rubber hose 15 is inserted into each one of the grooves 2 and positioned between the groove bottom 4 and its rodlike pressing element 8. The hose 1S is closed at one end 16, for instance by means of a vulcanization process, and at its opposite end it is provided with an end piece 17 to which the tube is fixed, preferably by means of a vulcanization process. The end piece 17 is provided with a connection plug 18 which is inserted in a radial bore 19 in the trunnion 12 and sealed off against the bore wall by means of an O-ring 20. The radial bore 19 (see FIGS. 1 and 3) from each endpiece 17 of each notch opens into an axial admission passage 21 in the trunnion 12, at the outer end of which is arranged a valve 22 permitting compressed air to be forced from the outside into the passage 21 but being automatically closed off by the internalpressure in the hoses 1S. The endpieces 17 are surrounded by a common sleeve 23 passed on the trunnion 12 and retained in axial position by a safety ring 24. A similar sleeve 25 is passed on the opposite trunnion 13 and is retained axially by means of a safety ring 26. v

A winding sleeve'27 (indicated by dash and dot lines in FIG. 2) onto which a paper web is to be wound, is-imagined passed on the roll spindle. When air pressure is applied through valve 22 the hoses l5 expand-see left hose 15' in FIG. 2 which hose is fully expanded-whereby the pressing elements 8 which are imagined manufactured through bending of sheet metal rails, are being displaced radially outwards so as to engage by means of the radially outer border of their T-stem 9 with the inner surface of sleeve 27. As the roll spindle is driven, it brings with it the sleeve 27 when rotating. It is evident that since the pressure from the hoses I5, 15' acts in a direction radially outwards against the legs 10, see arrows 28 in FIG. 2, the pressing elements 8 will be favorably supported precisely on account of the obtusel angle il which the legs 10 form relatively each other. v

Whereas in the embodiment shown in FIG. 2 the rails 6 are imagined attached positioned the longitudinal beads 5 of the profile l by means of so called plug welds 29 the joint in accordance with the embodiment shown in FIG. 5 between the rails 6 and the beads 5 could be made by means of so-called pop rivets 30. In accordance with FIG. 5 the pressing elements FIGS. 8' are furthermore imagined manufactured through extrusion and the radially outer border face on the T-stem 9' are provided with longitudinally extending grooves 3l' to provide a firmer grip with the winding sleeve 27. In this roll spindle, the profiled tube 1 is reinforced by a tube 32 inserted axially and attached to the notch bottoms 4 by means of pop rivets 33.

Experience has proventhat the rodlike pressing elements 8 serving as carrier means should run along the spindle over their entire length, i.e. preferably be continuous. This is because when using relatively soft winding sleeves 27 of paper, difficulties might arise when removing the sleeves from the spindle on account of more or less spotlike indentations formed in the sleeve material by the elements 8. It might also be of importance to avoid that too large areas of the sleeves 27 rest on the roll spindle. This is particularly important when using paper sleeves 27 of a kind that for some reason have moist inside surfaces, for example are freshly made or have been kept in a moist storage. The innermost paper layer of such winding sleeves 27 in such cases tend to adhere to the roll spindle. Should the adhering area then be sufficiently wide, the paper wil be torn when the sleeve is being removed from the roll spindle and roll up to form a rather efficient stop preventing further removal of the sleeve. In cases where the use of moist winding sleeves 27 is to be expected, the arcuate rails 6 should thereforebe provided with longitudinal (not shown) grooves at the points of contact with the inner surface ofthe winding sleeve.

When using the roll spindle in connection with hard winding sleeves 27 which are resistant to T-stem and where the above indicated disadvantages cannot conceivably occur, the embodiment shown in FIGS. 6 and 7 might be pertinent. In accordance with this embodiment the rails 6 the cross-sectional shape of which is that of the arc of a circle have a zigzagshaped appearance and the pressing elements 8" consist of sheet metal strips bent to the shape of a U with legs 34, 35 of the U directed alternatively substantially radially outwards and extending through the gaps 7' positioned in zigzag between adjacent rails 6. The latter may be attached to the profiled tube by means of pop rivets 30 (FIG. 5) and might be interconnected by means of welded spots 36 (FIG. 6). The ends of the legs 34 of the pressing elements 8" protruding through the gaps 7 should be beveled to facilitate the removal of the winding sleeve 27 from the roll spindle.

The embodiments as shown and described are to be regarded as examples onlyand the various parts of the roll spindle could be constructively inodied in a variety of ways within the scope of the appended claims. Instead of rubber, plastic might be used for the hoses and the end pieces 17. The number of grooves 2 in the profiled tube 1 is independent of the invention. The tube l might be made from plastic, preferably glass fibre reinforced plastic or plastic reinforced in some other way. To obtain the largest possible bending moment on the tube l the notch walls 3 should extend essentially in a radial direction.

I claim: y

l. An improved roll spindle for gripping winding sleeves for paper rolls 27 and the like, comprising expanding means in the form of hoses 15, said hoses 15 being inserted in longitudinal notches 2 formed in the spindle for displacing, when inflated, in a direction radially outwards, a pressing element 8 in the shape of a rod, each such pressing element being inserted in each notch, in such a manner that the radially outer border of the element, serving as a catching border against the inner surface of the winding sleeve 27, will extend outside the periphery of the spindle, the improvement comprising a profiled tube l in which notches 2 are disposed, said notches having outwardly diverging sidewalls 3 longitudinally extending rails 6 of sheet metal the cross-sectional shape of which is substantially that of an arc of a circle,` longitudinally extending beads 5 formed in the tube 1 between the notches 2 said rails 6 being attached to said beads 5 the longer side of said rails 6 serving as guidesfor the pressing elements 8.

2. A roll spindle as claimed in claim l, wherein an axial stiffening tube 32 is attached to the bottom 4 of the notches 2.

3. An improved roll spindle as claimed in claim l, wherein the pressing elements 8 consist of profiled rails of T-shaped cross section.

4. A roll spindle as claimed in claim 3, wherein the legs l0) of the cross stem of the T are arranged in such a way that said legs enclose an obtuse angle 11 with each other.

5, An improved roll spindle as claimed in claim 1, wherein the pressing elements 8" consist of profiled rails of U-shaped cross section, the legs 34,35 of the U being directed radially outward. T-shaped 6. An improved roll spindle as claimed in claim 5, wherein the legs 34,35 of the U extend alternatively radially outwards.

7. An improved roll spindle as claimed in claim 1, wherein the hoses 15 are closed at one end, preferably by means of a vulcanization process, and provided at their opposite end with an end piece 17, said end piece presenting a connection plug 18 to be inserted in a radial bore 19 said bore 19 extending in a trunnion 12 of the spindle, an O-ring 20 sealing off said bore from the bore wall.

6. An improved roll spindle as claimed in claim 5, wherein the legs 3 4, 35 of the U extend alternatively radially outwards. 7. ri improved roll spindle as claimed in claim l, wherein the hoses 15 are closed at one end, preferably by means of a vulcanization process, and provided at their opposite end with an end piece 17, said end piece presenting a connection plug 18 to be inserted in a radial bore 19 said bore 19 extending in from the bore wall.

UNITED STATES PATENT OFFICE CERTIFICATE 0F CORRECTION Patent No. 3 552 l 672 Dated January 5 1971 Inventor(5) Karl Einar Lage Grettve,

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column Line Error l 58 "T-shaped" should be deleted 2 48 "attached positioned the" should read attached to 3 8 "resistant to T-stem" should read resistant to deformation 4 22 "T-shaped" should be deleted Claim 5 4 32-40 These lines should be deleted Signed and sealed this 25th day of May 1971 (SEAL) Attest:

EDWARD M.FLETGHER,JR. WILLIAM E. SCHUYLER, JR. Att-,eating Officer Commissioner of Patents 

1. An improved roll spindle for gripping winding sleeves for paper rolls 27 and the like, comprising expanding means in the form of hoses 15, said hoses 15 being inserted in longitudinal notches 2 formed in the spindle for displacing, when inflated, in a direction radially outwards, a pressing element 8 in the shape of a rod, each such pressing element being inserted in each notch, in such a manner that the radially outer border of the element, serving as a catching border against the inner surface of the winding sleeve 27, will extend outside the periphery of the spinDle, the improvement comprising a profiled tube 1 in which notches 2 are disposed, said notches having outwardly diverging sidewalls 3 longitudinally extending rails 6 of sheet metal the cross-sectional shape of which is substantially that of an arc of a circle, longitudinally extending beads 5 formed in the tube 1 between the notches 2 said rails 6 being attached to said beads 5 the longer side of said rails 6 serving as guides for the pressing elements
 8. 2. A roll spindle as claimed in claim 1, wherein an axial stiffening tube 32 is attached to the bottom 4 of the notches
 2. 3. An improved roll spindle as claimed in claim 1, wherein the pressing elements 8 consist of profiled rails of T-shaped cross section.
 4. A roll spindle as claimed in claim 3, wherein the legs (10) of the cross stem of the T are arranged in such a way that said legs enclose an obtuse angle 11 with each other.
 5. An improved roll spindle as claimed in claim 1, wherein the pressing elements 8'''' consist of profiled rails of U-shaped cross section, the legs 34,35 of the U being directed radially outward. T-shaped
 6. An improved roll spindle as claimed in claim 5, wherein the legs 34,35 of the U extend alternatively radially outwards.
 6. An improved roll spindle as claimed in claim 5, wherein the legs 34, 35 of the U extend alternatively radially outwards.
 7. An improved roll spindle as claimed in claim 1, wherein the hoses 15 are closed at one end, preferably by means of a vulcanization process, and provided at their opposite end with an end piece 17, said end piece presenting a connection plug 18 to be inserted in a radial bore 19 said bore 19 extending in a trunnion 12 of the spindle, an O-ring 20 sealing off said bore from the bore wall.
 7. An improved roll spindle as claimed in claim 1, wherein the hoses 15 are closed at one end, preferably by means of a vulcanization process, and provided at their opposite end with an end piece 17, said end piece presenting a connection plug 18 to be inserted in a radial bore 19 said bore 19 extending in a trunnion 12 of the spindle, an O-ring 20 sealing off said bore from the bore wall. 